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    The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5

    91353.pdf (2.707Mb)
    Access Status
    Open access
    Authors
    Urquhart, R.
    Bahramian, Arash
    Strader, J.
    Chomiuk, L.
    Ransom, S.M.
    Wang, Y.
    Heinke, C.
    Tudor, V.
    Miller-Jones, James
    Tetarenko, A.J.
    MacCarone, T.J.
    Sivakoff, G.R.
    Shishkovsky, L.
    Swihart, S.J.
    Tremou, E.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Urquhart, R. and Bahramian, A. and Strader, J. and Chomiuk, L. and Ransom, S.M. and Wang, Y. and Heinke, C. et al. 2020. The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5. Astrophysical Journal. 904 (2): ARTN 147.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/abb6fc
    ISSN
    0004-637X
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    URI
    http://hdl.handle.net/20.500.11937/91529
    Collection
    • Curtin Research Publications
    Abstract

    Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars (MSPs) known among Galactic globular clusters. Here we report new deep 2-8 GHz radio continuum observations of Terzan 5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sources within the cluster half-light radius, including 17 within the core radius. Nineteen are associated with previously studied MSPs and X-ray binaries. Three of the new radio sources have steep radio spectra and are located within the cluster core, as expected for MSPs. These three sources have hard X-ray photon indices (Γ = 1.3-1.5) and highly variable X-ray emission, suggesting they are binary MSPs belonging to the spider class. For the most X-ray luminous of these sources, the redback spider classification is confirmed by its X-ray light curve, which shows an orbital period of 12.32 hr and double-peaked structure around X-ray maximum. The likely discovery of bright binary MSPs in a well-studied cluster like Terzan 5 highlights how deep radio continuum imaging can complement pulsar search and timing observations in finding probable eclipsing systems. The other new radio source in the core has a flat radio spectrum and is X-ray faint (erg s-1) with a photon index Γ = 2.1 ± 0.5, consistent with the properties expected for a quiescent stellar-mass black hole X-ray binary.

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